"'Ad denied [the truth]," meaning: so He destroyed them. "And how [terrible] were My torment and My warnings?" meaning: it was severe.
﴿كَذَّبَتْ عَادٌ﴾ أَي: فأهلكتهم ﴿فَكَيْفَ كَانَ عَذَابِي وَنُذُرِ﴾ أَي: كَانَ شَدِيدا
